Properties and Simulating Research of Epoxy Resin/Micron-SiC/Nano-SiO 2 Composite

Ning Guo, Ruixiao Meng, Junguo Gao, Mingpeng He, Yue Zhang, Lizhi He and Haitao Hu
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Ning Guo: Key Laboratory of Engineering Dielectrics and Its Application of Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Ruixiao Meng: Key Laboratory of Engineering Dielectrics and Its Application of Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Junguo Gao: Key Laboratory of Engineering Dielectrics and Its Application of Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Mingpeng He: Dongfang Electric Machinery Co., Ltd., Deyang 618000, China
Yue Zhang: Dongfang Electric Machinery Co., Ltd., Deyang 618000, China
Lizhi He: Beijing Products Quality Inspection and Detection Institute, Beijing 101300, China
Haitao Hu: Key Laboratory of Engineering Dielectrics and Its Application of Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China

Energies, 2022, vol. 15, issue 13, 1-14

Abstract: The dielectric behavior of insulations is a key factor affecting the development of anti-corona materials for generators. Epoxy resin (EP), as the matrix, is blended with inorganic fillers of micron SiC and nano SiO 2 to investigate the effect of micro and nano doping on the conductivity and breakdown mechanism of the composites. Using experimental and simulation analysis, it is found that the effect of nano-SiO 2 doping concentration on the conductivity is related to the dispersion of SiC particles. The lower concentration of SiO 2 could decrease the conductivity of the composites. The conductivity increases with raising the nano-SiO 2 doping concentration to a critical value. Meanwhile, the breakdown field strength of the composites decreases with the rising content of SiC in constant SiO 2 and increases with more SiO 2 when mixed with invariable SiC. When an equivalent electric field is applied to the samples, the electric field at the interface of micron particles is much stronger than the average field of the dielectric, close to the critical electric field of the tunneling effect. The density of the homopolar space charge bound to the surface of the stator bar elevates as the concentration of filled nanoparticles increases, by which a more effective Coulomb potential shield can be built to inhibit the further injection of carriers from the electrode to the interior of the anti-corona layer, thus reducing the space charge accumulation in the anti-corona layer as well as increasing the breakdown field strength of the dielectric.

Keywords: micro-nano composite materials; nonlinear conductivity; dielectric properties; composite structural model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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